Explosive-engine



No. 625,839'. Patented May' so, |899.

L. B'. DUMAN. ExP'LoslvE ENGINE.

(Application medeb. 4, 199s.) (N0 Mbdel.)

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port a is generally formed with diyerging NITE-D STATES LEWIS B. DoMAN, on ELERIDGE, NEW YORK.

EXPLOSlVE-ENGINE.

SPECIFICATION forming part of Letters Application filed February 4, 1898.

To a/ZZ whom, it may con/067%.`

Be it known that I, LEWIS B. DOMAN, of Elbridge, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Gas- Engines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to gas-engines, and has for its object the production of a gasengine which is particularly simple in construction, noiseless in operation, and highly effective in use; and to this end it consists in the combination, construction, and arrangement of the component parts of a gas-engine, as hereinafter fully described, and pointed out in the claims. V

In describing this invention reference is had to the accompanying drawings, forming part of this specification, in which like letters indicate corresponding parts in all the Views.

Figure l is a side elevation of my gas-engine. Fig. 2 is a vertical section taken on Fig. 3 is a Vertical section of the upper portion of a slightly-modified construction of my invention.

As preferably constructed my gas-engine consists of an explosion-chamber A, provided with inlet and outlet ports, a compressionchamber B, connected to the inlet-port of the chamber A, a piston C, movable in the eX- plosion-chamber A and operating to com press air or otherfluids in the chamber B during its expansion-stroke, a valve D for controlling the outward passage of fluids from the chamber A, and means for holding the valve D open during a portion of the compressionstroke of the piston C andfor holding said valve closed during a greater portion of 'the expansion-stroke of said piston.

The chambers A B are of any suitable form, size, and construction and are usually a1"- ranged one above the other.

The chamber A is preferably provided Vwith an inlet-port a, for air and a second inlet-port ct' for a suitable fuel, as a gasolene-spray. The inlet-port a is usually formed in the top of the chamber A and is normally closed by a suitable valve a2, which may be held in its normal position by a spring 0.3. The inletbranches and communicates with an' inlet- Patent No. 625,839, dated May 3o, 1899.

seria No. 669,109. crd model.)

chamber a4. A suitable conduite discharges gasolene or other fuel into the chamber a4,

anda plunger e is movable in the chamber a4 for forcing the gasolene in a spray through the diverging branches of the port a. The plunger e' is operated by any suitable means, as a spring e2, a rotary cam e3, and a suitable governor E, which forces the cam e3 into and out of its operative-position.

The chamber A is usually provided with outlet-ports a5 a6, arranged at unequal distances from the portionV of said chamber in which the air and fuel are compressed, and these ports a5 al; are generally connected by a conduit a7. The port a5 is arranged nearest the portion of said chamber A in which the air and `fuel are compressed, and the passage of fluids therethrough ispreferably controlled by the valve D, which is so actuated that it is open during a portion of the compression-stroke of the piston C and is closed during a greater portion of the expansionstroke of said piston. The means for actuating the valve D may be of any suitable construction and is here illustrated as a spring e4 and a calne. The port a5 preferably opens from substantially the central portion of the chamber A, but may open from the upper end of said chamber, as illustrated in Fig. 3, in Which figure A represents an explosionchamber and d10 an outlet-port similar to the outlet-port a5. The port asis arranged slightly above the position assumed by the upper -face of the piston C when 'at the limit of its expansion-stroke, as best seen in Fig. 2, and in the preferable construction of my invention a number of the ports a6 open in a circular series from the chamber A.

The air and fuel Within the chamber A are exploded by any suitable igniter, here illustrated as an electric terminal a3, connected to the Wall of the chamber A, andan electric terminal a9, insulated from the Wall of said chamber and projecting into the path of the npperface of the piston C, so as to beengaged by said piston when the same reaches the-limit of itscompression-stroke, and thus permit the passage of an electric spark Within the explosion-chamber, Y

The compression-chamber B is supplied With air by a suitable inlet-conduit b and is connected to the inlet-port a of the chamber IOO A by a conduit b. It is obvious, however, that the chamber B may be dispensed with and that any other suitable means for supplying air to the chamber A may be substituted.

The piston C is of any desirable form, size, and construction, is movable in a guide-chainber c, forming a continuation of the explosion-chamberA, and is movable successively beyond the ports a a5. Any suitable means may be used for actuating the piston C, as a con nection or pitman c and a rotary disk c2, movable in the compression-chamber B. The disk c2 is usually mounted upon a revoluble shaft c3, suitably connected, as by bevel-gears c, to an upright shaft e7, which supports the cams e3 e5 and the governor E, previously described.

In the operation of my gas-engine the explosion of the air and fuel forces the piston C downwardly past the ports c5 a, and as the piston C descends the exploded gases expand until said piston reaches the ports d, Whereupon the valve D opens the port a5 and the expanded gases pass through the ports a5 c at substantially atmospheric pressure. The downward movement of the piston compresses the air within the chamber B,and said compressed air passes through the conduit D', forces the valve d2 from its operative position, and enters the chamber A for facilitating the escape of the burned gasesv from the ports a5 bf. During the admission of the air into the chamber A the gasolene-spray is inserted through the inlet-port a'. As the piston C rises it successively passes the ports a6. d", although no compression of the air and fuel is effected by the upward movement of the piston C until the upper face of said piston is substantially alined with the valve D, whereupon said valve closes and prevents additional outward passage through the port a5. The piston C continues its upward movement after the closing of the valve D, thus compressing the air and fuel within the upper portion of the chamber A and closingthe valve a2, and as said piston reaches the limit of its upward movement or compressionstroke it encounters the terminal a9 and effects the desired explosion. It therefore follows that the piston C compresses the air and fuel during only a portion of its upward or compression stroke and that the exploded gases are free to expand duringaconsiderably greater portion of the expansion-stroke or downward movement of the piston C.

By constructing my gasengine so as to operate as described the exploded gases pass therefrom at substantially atmospheric pressure, thus utilizing substantially all of the expansive action of the exploded gases, reducing the noise incidental'to the operation of the gas-engine, effectually expelling the exploded gases from the explosion-chamber A,

and insuring an explosion of the air and fuel upon each upward movement of the piston C.

The construction and operation of my gasengine will now be readily understood upon reference to the foregoing description and the accompanying drawings, and it will be readily understood that I do not limit myself to the exact construction and arrangement of the component parts of said engine, since the same may be somewhat varied without departing from the spirit of my invention.

Having thusfully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a gas-engine, an explosion-chamber, a compression-chamber, an air-inlet port a connected with the explosion-chamber, an automatically-acting valve for controlling the inlet-port, and a piston movable in said explosion-chamber, combined with outlet-ports arranged one in advance of the other, a valve for controlling the outlet-port that is arranged nearest to the inlet-port, an inlet-port for the feed of fuel, a piston for controlling the feed of the fuel, and a rotary shaft provided with suitable means for operating both the outletvalve and the piston which controls the feed of fuel, substantially as shown.

2. In a gas-engine, an explosion-chamber, an air-inlet port a and outlet-ports which latter ports are arranged one in advance of the other, combined with an inlet-port a' for the fuel, a cylinder into which the fuel is fed, and a piston for forcing the fue] into the explosionchamber; a feed-pipe connected to the cylinder, and a rotary shaft provided with means for operating the feedpiston whereby the feeding of fuel to the explosion-chamber is controlled, substantially as described.

3. In a gas-engine, an explosion-chamber, an air-inlet port controlled by an automatically-operated valve, outlet-ports arranged one in advance of the other, and a valve for controlling the outlet-port that is arranged nearest to the inlet-port; a feed-inlet, a cylinder connected to said feed-inlet, a piston working in said cylinder, a feed-pipe connected to the cylinder, a piston working in the explosionchamber, a governor-shaft connected lindirectly to the piston in the explosion-chamber, and means connected to the shaft for allowing the outlet-valve to automatically open, and means for forcing the feed-piston inwardly at the same time that the outlet-valve is opened.

In testimony whereof I have hereunto signed my name, in the presence of two attesting witnesses, at Elbridge, in the county of Onondaga, in the State of New York, this 20th day of October, 1897.

^ LEWIS B. DOMAN.

Witnesses:

A. B. FRAZER, E. J. KEsTER.

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